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Letters Patent No. 103,868. dated J une 7, 1870.

IMPROVEMENT IN LOCKS.

The Schedule referred to in 'these Letters Pat-ent and making part of tne same.

To all whom it may concern Be it known that I, JOHN GRARD, of Trenton, in the county-of Mercer and State ot' New Jersey, have invented a new and useful Improvement in flocks; and I do hereby declare that the Jllowing is a full, clear, and exact description thereo., which will enable others skilled in thel art to Vmake and use the same, reference heilig had to the accompanying draw ing ibrming part ot' this specification.

'lhe invention relates to mortise-locks, and consists- First, in combining the latch-bolt lever with the cam, as hereinafter specified, and dispensing altogether with a slide, as used under thc patent to B. Erbe, Nov. 6, 1866.

Second, in combining a striking-plate. l

Figure l is an elevation of my improved lock, with one plate removed, showing the position of the parts whenthc lever is in working position, and the latchbolt is shot.;

Figure 2 isa partial section in the sam'e View, showing the lever thrown back, and thc latch-holt drawn out for turning;

Figure 3 is an elevation of the striking-plate and spring attached;

Figure 4 is a cross-section of the tail of the latchbolt; and

Figure 5 is a cross-section of the locking-bolt.

'The latch-bolt lever A is pivoted, at the top, by a small steel pin, B, in the point of a cam-plate, C, let into a slot in the top plate oi' the case, and provided with a small handle, D.

At the junction ot' this handle is a small notch, forming a projection, E, which engages with a notch, F, in the back plate ofthe lock, when the cam is forced down, as shown in iig. 2, and holds it from being forced up again.

lhe pin B projects at one side, and works in an inclined groove or slot, G, in one of the side plates, by which the point ot' the cam is controlled, and the cam and lever A are held up.

The spring H, which keeps the lever A up against the tumbler I, also has a teudencv to keep thc point friction-spring with the ll ot' the cam engaged with the notch F.

-To raise the cam up for letting the upper ond of the lever A back, as shown in tig. 2, the cam is first pushed forward a short distance to disengage the point E.

lVhen thc lock is placed in the mortise in the door, the wall of the Inortise prevents the cam from raising it, and confines the lever in the I'equred position.

In' order to be able t provide,the smallest latchbolt tails or Shanks K,that may be consistent with the strength required, and also to cause the least blowing of the composition to make the head, 1 propose to use Wrought or rolled-metal tails, made in' the form shown in cross-section at Eg. 4, which possesses great strength, and is favorable. to the adhesion of the metal east around it.

I propose, also, to employ knob-spindles, of the same form, which are preferable ou account ot' the strength, and they require less drilling in attaching the knobs.

I also propose to employ flat, wrought, or rolledmetal locking-bolt shauks, L, with strengtheninganges, M, at theiedges; also, for the purpose ot reducing the quantity ot' metal used, as much as possible, both for economy and for insuring more homogeneous cas'tings for the heads.

N is the friction-spring, attached to the strikingplatc O, and arranged to bear against the front plate of the lock, when the door is shut, to prevent it tirom rattling when the wind blows, or when other doors are opened or closed suddenly.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- 1. The latch-buit lever A, pivoted to the cam O by the steel pin IS, working in the inclined slot G, the said cam being arranged in a slot in the top ot" the` lock, and arranged to catch in a notch, F, to hold the lever in the working position, all substantially as specified.

2. The combination, with the striking-plate, of thc friction-spring N, subsftntially as specified.

`ToHN Gaiman.

Witnesses:

J UDLAH H. Boonen, vJonN E, Fono. 

